High-precision test system for medical endoscope wire rod

Abstract

The utility model relates to a high-precision test system for a medical endoscope wire. The high-precision test system comprises a booster circuit, a constant current source, a first test point, an operational amplifier subtractor circuit, a second test point and a display end, the first test point and the second test point are respectively used for being electrically connected with two ends of a coaxial line to be detected; the booster circuit is used for providing target power with the voltage corresponding to the wire diameter to the constant current source according to the wire diameter of the coaxial wire to be detected; the constant current source is used for outputting a constant target current to the coaxial line to be detected based on the target power; the operational amplifier subtractor circuit is used for determining a target voltage difference between the first test point and the second test point according to the first voltage of the first test point and the second voltage of the second test point; and the display end is used for determining the coaxial line diameter of the to-be-detected coaxial line and visually displaying the coaxial line diameter according to the resistance resolution and length of the to-be-detected coaxial line and the target voltage difference. And the efficiency and the accuracy of coaxial line diameter detection are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of medical equipment detection, and in particular to a high-precision testing system for medical endoscope wires. Background Art

[0002] Medical products often use 45 AWG and 46 AWG (American Wire Gauge) ultra-fine coaxial cables. Since the diameter of the wire core is only 0.04mm, it is difficult to detect the wire diameter of the incoming coaxial cables. Manual measurement is required, which is inefficient and prone to misjudgment. Summary of the invention

[0003] In order to overcome the technical problems in the related art that it is difficult to detect the wire diameter of the incoming coaxial line, manual measurement is required, the efficiency is low, and it is easy to misjudge, the present invention provides a high-precision testing system for medical endoscope wires.

[0004] According to an embodiment of the present disclosure, a high-precision testing system for medical endoscope wires is provided, comprising:

[0005] A boost circuit, a constant current source electrically connected to the boost circuit, a first test point electrically connected to the constant current source, an operational amplifier subtractor circuit electrically connected to the constant current source, a second test point electrically connected to the operational amplifier subtractor circuit, and a display terminal connected to the operational amplifier subtractor circuit;

[0006] Wherein, the first test point is used to be electrically connected to the first end of the coaxial line to be detected, and the second test point is used to be electrically connected to the second end of the coaxial line to be detected;

[0007] The boost circuit is used to provide target power of a voltage magnitude corresponding to the wire diameter to the constant current source according to the wire diameter of the coaxial line to be detected;

[0008] The constant current source is used to output a target current of a constant magnitude to the coaxial line to be detected based on the target power;

[0009] The operational amplifier subtractor circuit is used to determine a target voltage difference between the first test point and the second test point based on a first voltage at the first test point and a second voltage at the second test point;

[0010] The display end is used to determine the diameter of the coaxial line to be detected and to visually display the diameter of the coaxial line according to the resistance resolution and length of the coaxial line to be detected and the target voltage difference.

[0011] In one implementation, the operational amplifier subtractor circuit includes: a voltage difference calculation subcircuit, an analog-to-digital converter connected to an output end of the voltage difference calculation subcircuit, an I2C interface of the analog-to-digital converter connected to the display end, and an input end of the voltage difference calculation subcircuit electrically connected to the first test point and the second test point respectively;

[0012] The voltage difference calculation subcircuit is used to calculate the voltage difference between the first test point and the second test point;

[0013] The analog-to-digital converter is used to perform analog-to-digital conversion on the voltage difference to obtain the target voltage difference of digital type.

[0014] In one implementation, the voltage difference calculation subcircuit includes: an amplifier, resistors R1 and R2 whose first ends are both electrically connected to the non-inverting input terminal of the amplifier, a resistor R3 whose first end is electrically connected to the inverting input terminal of the amplifier, and a resistor R4 whose first end is electrically connected to the inverting input terminal of the amplifier;

[0015] The second end of the resistor R1 is electrically connected to the first test point, the second end of the resistor R2 is grounded, the second end of the resistor R3 is electrically connected to the second test point, the second end of the resistor R4 is electrically connected to the output end of the amplifier, and the output end of the amplifier is electrically connected to the input end of the analog-to-digital converter;

[0016] The voltage difference output by the amplifier is the product of the voltage difference between the first test point and the second test point and the ratio between the resistor R4 and the resistor R3.

[0017] In one implementation, the boost circuit includes:

[0018] A microcontroller unit U2, an inductor L1 having a first end connected to a VDD input terminal of the microcontroller unit U2, a capacitor C1 having a first end connected to a first connection point, a diode D1 having an anode connected to a second end of the inductor L1, a resistor R5 having first ends connected to a cathode of the diode D1, capacitors C2 and C3, and a resistor R6 having a first end connected to a second connection point;

[0019] The first connection point is a connection point between the VDD input terminal of the micro control unit U2 and the first end of the inductor L1, the CE input terminal of the micro control unit U2 is connected to the first connection point, the second end of the capacitor C1 is grounded, and the first connection point is connected to the first end of the capacitor C1 to be constructed as a voltage input terminal of the boost circuit;

[0020] The first connection point is a connection point between the second end of the resistor R5 and the FB input end of the micro control unit U2, and the second ends of the capacitor C2, the capacitor C3 and the resistor R6 are all grounded;

[0021] The cathode of the diode D1 is connected to the first end of the capacitor C3 to form a voltage output end of the boost circuit.

[0022] In one implementation, the constant current source includes: a resistor R7, a microcontroller unit U1 whose REXT input terminal is connected to a first end of the resistor R7, a resistor R8 and a capacitor C4 whose first ends are both connected to an output end of the microcontroller unit U1;

[0023] Wherein, the micro control unit U1 is connected to the second end of the resistor R7 to be configured as a voltage input end of the constant current source, and the second end of the resistor R8 is configured as a voltage output end of the constant current source;

[0024] The second terminal of the capacitor C4 is grounded.

[0025] In one implementation, the system further includes: an indicator light electrically connected to both the second test point and the operational amplifier subtractor circuit;

[0026] The indicator light is used to indicate whether the coaxial line to be detected is open circuit.

[0027] In one implementation, the display terminal includes a single-chip microcomputer and a PC terminal, and the single-chip microcomputer is connected to the operational amplifier subtractor circuit;

[0028] The single chip microcomputer is used to determine the diameter of the coaxial line of the coaxial line to be detected according to the resistance resolution and length of the coaxial line to be detected and the target voltage difference;

[0029] The PC terminal is used to visually display the coaxial line diameter.

[0030] In one implementation, the system includes a plurality of the constant current sources, each of the constant current sources is electrically connected to one of the first test points and one of the operational amplifier subtractor circuits, and the plurality of operational amplifier subtractor circuits are connected to the display terminal.

[0031] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0032] The high-precision test system for medical endoscope wires is used to electrically connect the two ends of the coaxial line to be tested through the first test point and the second test point respectively; the boost circuit is used to provide the target power of the voltage size corresponding to the wire diameter to the constant current source according to the wire diameter of the coaxial line to be tested; the constant current source is used to output a constant target current to the coaxial line to be tested based on the target power; the operational amplifier subtractor circuit is used to determine the target voltage difference between the first test point and the second test point according to the first voltage of the first test point and the second voltage of the second test point; the display end is used to determine the coaxial line diameter of the coaxial line to be tested and visually display the coaxial line diameter according to the resistance resolution and length of the coaxial line to be tested, as well as the target voltage difference. Improve the efficiency and accuracy of the coaxial line diameter detection.

[0033] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0035] Figure 1 The invention is a block diagram of a high-precision testing system for medical endoscope wires according to an exemplary embodiment.

[0036] Figure 2 is a circuit diagram of an analog-to-digital converter according to an exemplary embodiment.

[0037] Figure 3 is a circuit diagram of a voltage difference calculation subcircuit according to an exemplary embodiment.

[0038] Figure 4 is a circuit diagram of a voltage boosting circuit according to an exemplary embodiment.

[0039] Figure 5 is a circuit diagram of a constant current source according to an exemplary embodiment.

[0040] Figure 6 is a block diagram of another high-precision testing system for medical endoscope wires according to an exemplary embodiment. DETAILED DESCRIPTION

[0041] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0042] Figure 1 is a block diagram of a high-precision testing system for medical endoscope wires according to an exemplary embodiment. Figure 1 As shown, including:

[0043] A boost circuit, a constant current source electrically connected to the boost circuit, a first test point electrically connected to the constant current source, an operational amplifier subtractor circuit electrically connected to the constant current source, a second test point electrically connected to the operational amplifier subtractor circuit, and a display terminal connected to the operational amplifier subtractor circuit;

[0044] Wherein, the first test point is used to be electrically connected to the first end of the coaxial line to be detected, and the second test point is used to be electrically connected to the second end of the coaxial line to be detected;

[0045] The boost circuit is used to provide target power of a voltage magnitude corresponding to the wire diameter to the constant current source according to the wire diameter of the coaxial line to be detected;

[0046] The constant current source is used to output a target current of a constant magnitude to the coaxial line to be detected based on the target power;

[0047] The operational amplifier subtractor circuit is used to determine a target voltage difference between the first test point and the second test point based on a first voltage at the first test point and a second voltage at the second test point;

[0048] The display end is used to determine the diameter of the coaxial line to be detected and to visually display the diameter of the coaxial line according to the resistance resolution and length of the coaxial line to be detected and the target voltage difference.

[0049] In the disclosed embodiment, before the test begins, the system first identifies the wire diameter specification of the coaxial line to be tested. After the boost circuit receives this information, it will output a voltage corresponding to the wire diameter size according to the preset voltage-wire diameter correspondence. This voltage is specially designed for the subsequent constant current source power supply to ensure the stable output of current.

[0050] Assuming that the diameter of the coaxial line to be tested is 0.5mm, according to the system preset, the boost circuit will output a voltage of 5V. This voltage can meet the power supply requirements of the constant current source for this wire diameter, ensuring the accuracy of the test.

[0051] Furthermore, the constant current source starts working after receiving the target power provided by the boost circuit. It will output a constant current according to the preset current size. This current will flow through the coaxial line to be tested and is used to measure the resistance or other related parameters of the coaxial line. For example: the constant current source outputs a constant current of 1mA according to the 5V voltage provided by the boost circuit. This current flows stably through the coaxial line to be tested to ensure the accuracy of the test results.

[0052] Furthermore, the first test point and the second test point are connected to the two ends of the coaxial line to be tested. When the current output by the constant current source flows through the coaxial line, the two test points will measure the voltages at the two ends of the coaxial line respectively. These voltage data will be used for the subsequent calculation of the voltage difference. For example: the voltage measured at the first test point is 2V, and the voltage measured at the second test point is 1V. These two data will be used for the subsequent calculation of the voltage difference, thereby inferring the resistance or other relevant parameters of the coaxial line.

[0053] Furthermore, the op amp subtractor circuit receives the voltage data from the first test point and the second test point, and performs a subtraction operation through the operational amplifier to determine the voltage difference between the two points. This voltage difference is an important parameter for evaluating the performance of the coaxial line. For example, the voltage at the first test point received by the op amp subtractor circuit is 2V, and the voltage at the second test point is 1V. After the subtraction operation, the voltage difference is 1V. This voltage difference data will be used for subsequent analysis.

[0054] Furthermore, the display end receives the voltage difference data from the op amp subtractor circuit, and calculates the wire diameter of the coaxial line through a preset algorithm in combination with the resistance resolution, length and other parameters of the coaxial line to be tested. The calculation results will be displayed to the user in a visual form, so that the user can intuitively understand the performance of the coaxial line. For example: the display end receives data with a voltage difference of 1V, and combines the resistance resolution and length information of the coaxial line to be tested. The algorithm calculates that the wire diameter of the coaxial line is 0.5mm. This result is displayed on the display screen in the form of a chart or number, and the user can directly see the test result.

[0055] The high-precision test system for medical endoscope wires of the above technical solution is used to electrically connect to the two ends of the coaxial line to be detected through the first test point and the second test point respectively; the boost circuit is used to provide the target power of the voltage size corresponding to the wire diameter to the constant current source according to the wire diameter of the coaxial line to be detected; the constant current source is used to output a constant target current to the coaxial line to be detected based on the target power; the operational amplifier subtractor circuit is used to determine the target voltage difference between the first test point and the second test point according to the first voltage of the first test point and the second voltage of the second test point; the display end is used to determine the coaxial line diameter of the coaxial line to be detected and visually display the coaxial line diameter according to the resistance resolution and length of the coaxial line to be detected, as well as the target voltage difference. Improve the efficiency and accuracy of the coaxial line diameter detection.

[0056] In one implementation, the operational amplifier subtractor circuit includes: a voltage difference calculation subcircuit, an analog-to-digital converter connected to an output end of the voltage difference calculation subcircuit, an I2C interface of the analog-to-digital converter connected to the display end, and an input end of the voltage difference calculation subcircuit electrically connected to the first test point and the second test point respectively;

[0057] The voltage difference calculation subcircuit is used to calculate the voltage difference between the first test point and the second test point;

[0058] The analog-to-digital converter is used to perform analog-to-digital conversion on the voltage difference to obtain the target voltage difference of digital type.

[0059] See also Figure 2 The analog-to-digital converter shown in FIG. 1 includes a microcontroller unit U3, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11 and a capacitor C5. The specific connection relationship can be as follows: Figure 2 shown.

[0060] In the disclosed embodiment, the voltage difference calculation subcircuit is the core part of the op amp subtractor circuit, which is specifically responsible for calculating the voltage difference between the first test point and the second test point. It obtains the voltage values ​​of the two test points in real time by connecting the input ends of the first test point and the second test point. For example: in the test of medical endoscope wire, the voltage measured at the first test point is 3.2V, while the voltage measured at the second test point is 2.8V. After receiving the two voltage signals, the voltage difference calculation subcircuit immediately calculates and obtains that the voltage difference between the two test points is 0.4V.

[0061] Furthermore, the analog-to-digital converter (ADC) is another key component in the op amp subtractor circuit. Its function is to convert the analog voltage difference signal calculated by the voltage difference calculation subcircuit into a digital target voltage difference. In this way, the digital signal can be processed and analyzed by the display terminal or other digital systems. For example: the analog signal with a voltage difference of 0.4V calculated by the voltage difference calculation subcircuit is sent to the analog-to-digital converter. The analog-to-digital converter quickly converts this analog signal into a voltage difference in digital form, such as a value represented by a 10-bit binary number. This digital target voltage difference is more convenient for subsequent data processing and display.

[0062] Furthermore, the analog-to-digital converter is connected to the display end through an I2C (Inter-Integrated Circuit) interface. I2C is a bidirectional serial communication bus used to connect low-speed peripheral devices. Through the I2C interface, the analog-to-digital converter can transmit the converted digital type target voltage difference to the display end. For example: the analog-to-digital converter establishes a communication connection with the display end of the medical endoscope wire test system through the I2C interface. Once the analog-to-digital converter completes the analog-to-digital conversion of the voltage difference, it immediately sends the digital type target voltage difference to the display end through the I2C interface. In this way, the display end can obtain the voltage difference data in real time and perform subsequent processing and display.

[0063] Furthermore, after the display end receives the digital target voltage difference from the analog-to-digital converter, it combines other relevant information (such as the resistance resolution and length of the coaxial line to be tested) to calculate the wire diameter of the coaxial line through a preset algorithm, and displays the result to the user in a visual form. For example: the display end receives the digital target voltage difference data sent by the analog-to-digital converter through the I2C interface. Combined with the known resistance resolution and coaxial line length, the display end calculates that the wire diameter of the coaxial line is 0.45mm through a built-in algorithm. This result is clearly displayed on the display screen in the form of a chart or number, and the tester can directly read the precise wire diameter data to evaluate the performance of the medical endoscope wire.

[0064] The op amp subtractor circuit and its components play a key role in the high-precision test system of medical endoscope cables, ensuring the accuracy and reliability of the test.

[0065] In one implementation, see Figure 3 As shown, the voltage difference calculation subcircuit includes: an amplifier, resistors R1 and R2 whose first ends are electrically connected to the non-inverting input terminal of the amplifier, a resistor R3 whose first end is electrically connected to the inverting input terminal of the amplifier, and a resistor R4 whose first end is electrically connected to the inverting input terminal of the amplifier;

[0066] The second end of the resistor R1 is electrically connected to the first test point, the second end of the resistor R2 is grounded, the second end of the resistor R3 is electrically connected to the second test point, the second end of the resistor R4 is electrically connected to the output end of the amplifier, and the output end of the amplifier is electrically connected to the input end of the analog-to-digital converter;

[0067] The voltage difference output by the amplifier is the product of the voltage difference between the first test point and the second test point and the ratio between the resistor R4 and the resistor R3.

[0068] In the disclosed embodiment, in the voltage difference calculation subcircuit, resistors R1, R2, R3 and R4 play a key role. One end of the resistor R1 is connected to the positive phase input of the amplifier, and the other end is electrically connected to the first test point to obtain the voltage at the first end of the coaxial line to be detected. One end of the resistor R2 is connected to the positive phase input of the amplifier, and the other end is grounded to provide a reference point for the circuit. One end of the resistors R3 and R4 are both connected to the inverting input of the amplifier, wherein the other end of R3 is electrically connected to the second test point to obtain the voltage at the second end of the coaxial line to be detected. The other end of R4 is connected to the output of the amplifier to form a feedback loop. For example: In actual operation, resistors R1, R2, R3 and R4 are precisely selected and soldered to the circuit board. For example, the resistance values ​​of R1 and R2 may both be 10kΩ, the resistance value of R3 is 20kΩ, and the resistance value of R4 is 10kΩ. The first test point is connected to the first end of the coaxial line to be tested, and the measured voltage is 3V; the second test point is connected to the second end of the coaxial line to be tested, and the measured voltage is 2V.

[0069] Furthermore, the amplifier is the core component of the voltage difference calculation subcircuit. It adjusts the output voltage through the internal circuit according to the voltage difference between the non-inverting input and the inverting input to achieve the effect of amplification or reduction. Here, the non-inverting input of the amplifier receives the voltage signal from the first test point, while the inverting input receives the voltage signal from the second test point and the feedback resistor R4. For example: in the above scenario, the non-inverting input of the amplifier receives a voltage of 3V, and the voltage received by the inverting input will be lower than 3V due to the voltage divider effect of R3 and R4 (depending on the resistance ratio of R3 and R4). The amplifier adjusts the voltage at its output according to the voltage difference between the two input terminals to ensure that the output voltage is proportional to the voltage difference at the input terminals.

[0070] Further, the output voltage difference of the amplifier is calculated based on the ratio between resistor R4 and resistor R3. Since R4 is connected between the output terminal and the inverting input terminal of the amplifier, it forms a feedback loop for adjusting the output of the amplifier. This configuration results in a certain proportional relationship between the output voltage difference and the input voltage difference, and this ratio is determined by the resistance values ​​of R4 and R3. For example: Assume that in the above scenario, the resistance value of resistor R3 is twice that of resistor R4. When the voltage difference between the first test point and the second test point is 0.1V, due to the presence of feedback resistor R4, the amplifier will output an amplified voltage difference, which is the product of the input voltage difference and the ratio of R4 / R3 (i.e. 1 / 2). Therefore, if the input voltage difference is 0.1V, the output voltage difference will be 0.05V. This amplified voltage difference is then sent to the analog-to-digital converter for further processing.

[0071] Further, the analog-to-digital converter receives the analog voltage difference signal from the amplifier output and converts it into a digital signal. This digital signal is then transmitted to the display end through the I2C interface for subsequent data processing and display. For example: the analog-to-digital converter receives a 0.05V analog voltage difference signal output by the amplifier. It quickly converts this analog signal into a voltage difference in digital form, such as an 8-bit binary number. Then, this digital type of target voltage difference is sent to the display end through the I2C interface for further analysis and display.

[0072] The voltage difference calculation subcircuit accurately calculates the voltage difference between the first test point and the second test point and converts it into a digital signal, providing key data for high-precision testing of medical endoscope cables.

[0073] In one implementation, see Figure 4 As shown, the boost circuit comprises:

[0074] A microcontroller unit U2, an inductor L1 having a first end connected to a VDD input terminal of the microcontroller unit U2, a capacitor C1 having a first end connected to a first connection point, a diode D1 having an anode connected to a second end of the inductor L1, a resistor R5 having first ends connected to a cathode of the diode D1, capacitors C2 and C3, and a resistor R6 having a first end connected to a second connection point;

[0075] The first connection point is a connection point between the VDD input terminal of the micro control unit U2 and the first end of the inductor L1, the CE input terminal of the micro control unit U2 is connected to the first connection point, the second end of the capacitor C1 is grounded, and the first connection point is connected to the first end of the capacitor C1 to be constructed as a voltage input terminal of the boost circuit;

[0076] The first connection point is a connection point between the second end of the resistor R5 and the FB input end of the micro control unit U2, and the second ends of the capacitor C2, the capacitor C3 and the resistor R6 are all grounded;

[0077] The cathode of the diode D1 is connected to the first end of the capacitor C3 to form a voltage output end of the boost circuit.

[0078] In the disclosed embodiment, in the high-precision test system for medical endoscope wires, the microcontroller unit U2 is first initialized before the boost circuit starts working. The microcontroller unit U2 is responsible for controlling the working process of the boost circuit and outputting corresponding control signals according to the wire diameter requirements of the coaxial line to be tested. For example: the microcontroller unit U2 receives a system instruction and starts the initialization process. It configures internal registers, sets working modes and parameters, and prepares for the subsequent boost process.

[0079] Furthermore, the inductor L1 and the capacitor C1 form an LC filter structure in the circuit to smooth the noise and ripple in the power supply voltage. The inductor L1 can prevent high-frequency noise from passing through, while the capacitor C1 can absorb and release charges to further stabilize the power supply voltage. For example: when the power supply is supplying power to the boost circuit, the inductor L1 and the capacitor C1 work together to filter out the high-frequency noise and ripple in the power supply voltage, ensuring that the micro control unit U2 receives a stable power supply voltage.

[0080] Furthermore, the diode D1, the resistor R5, the capacitor C2 and the capacitor C3 together constitute the core part of the boost circuit. Under the control of the microcontroller unit U2, the voltage is increased by adjusting the current in the inductor L1 and the conduction state of the diode D1. The capacitor C2 and the capacitor C3 are used to store charge and smooth the output voltage. For example: when the microcontroller unit U2 detects that the voltage needs to be increased, it controls the current in the inductor L1 to gradually increase. When the current in the inductor L1 reaches a certain level, the microcontroller unit U2 turns on the diode D1, and the energy stored in the inductor L1 is released to the capacitor C2 and the capacitor C3 through the diode D1, thereby increasing the output voltage. The capacitor C2 and the capacitor C3 ensure the stability and smoothness of the output voltage.

[0081] Furthermore, the resistor R6 plays the role of voltage division and feedback in the circuit. One end of it is connected to the output end of the boost circuit, and the other end is grounded. Through the voltage division of the resistor R6, a part of the output voltage of the boost circuit can be obtained and fed back to the FB input end of the micro control unit U2. For example: the resistor R6 divides the output voltage of the boost circuit to obtain a smaller feedback voltage. This feedback voltage is sent to the FB input end of the micro control unit U2, and the micro control unit U2 adjusts the working state of the boost circuit according to this feedback voltage to ensure the stability and accuracy of the output voltage.

[0082] Furthermore, after the adjustment and control of the above steps, the boost circuit finally outputs a stable boost voltage. This boost voltage is sent to the constant current source to provide the required power for the constant current source. For example: the output end of the boost circuit is connected to the constant current source to provide stable power for the constant current source. In this way, the constant current source can output a constant current to the coaxial line to be tested, thereby ensuring the normal operation of the test system.

[0083] Among them, VOUT = 1.25 * (1 + R1 / R2) × 1.25 × (1 + 86.6 / 10) = 12.075V.

[0084] The boost circuit provides stable and reliable power support for the high-precision test system of medical endoscope cables, ensuring the accuracy and reliability of the test.

[0085] In one implementation, see Figure 5 As shown, the constant current source includes: a resistor R7, a micro control unit U1 whose REXT input terminal is connected to a first end of the resistor R7, a resistor R8 and a capacitor C4 whose first ends are both connected to an output end of the micro control unit U1;

[0086] Wherein, the micro control unit U1 is connected to the second end of the resistor R7 to be configured as a voltage input end of the constant current source, and the second end of the resistor R8 is configured as a voltage output end of the constant current source;

[0087] The second terminal of the capacitor C4 is grounded.

[0088] In the disclosed embodiment, in the high-precision test system for medical endoscope wires, the constant current source needs to be initialized before starting work. The microcontroller unit U1 is the core control component of the constant current source, which receives a stable voltage from the boost circuit and configures and calibrates internal parameters according to a preset current value. For example: When the test system is started, the microcontroller unit U1 starts initialization. It reads the preset current value stored in the internal memory and checks whether the external connection and circuit status are normal. After the initialization is completed, the microcontroller unit U1 is ready to receive the input voltage from the boost circuit and is ready to output a constant current.

[0089] Furthermore, the stable voltage output by the boost circuit is connected to the constant current source through the resistor R7. The resistor R7 plays the role of current limiting and voltage dividing here, ensuring that the REXT input terminal of the micro control unit U1 receives a suitable voltage signal. For example: After the 5V stable voltage output by the boost circuit passes through the resistor R7, its voltage signal after voltage division is sent to the REXT input terminal of the micro control unit U1. The micro control unit U1 adjusts its internal working state according to this voltage signal to prepare for the subsequent current output.

[0090] Furthermore, the microcontroller unit U1 controls the resistor R8 and the capacitor C4 through its output terminal according to the preset current value and input voltage to achieve a constant current output. The resistor R8 is used as the main component of the current output here, and the capacitor C4 is used to smooth the noise and ripple in the output current. For example: Assume that the preset current value is 10mA. The microcontroller unit U1 calculates the voltage value that needs to pass through the resistor R8 according to the input voltage and the preset current value. Then, it adjusts the voltage on the resistor R8 through its output terminal so that the current passing through the resistor R8 is exactly 10mA. At the same time, the capacitor C4 absorbs and releases the charge to ensure the stability of the output current.

[0091] Further, after the above configuration, the constant current source starts to output a constant current. This constant current is output through the second end of the resistor R8, and is used to provide a stable current source for the coaxial line to be tested. For example: the constant current source starts to stably output a current of 10mA. This current passes through the second end of the resistor R8 and is connected to one end of the coaxial line to be tested. Since the current is constant, it can be ensured that the voltage change on the coaxial line during the test is only determined by the wire diameter, thereby improving the accuracy and reliability of the test.

[0092] Furthermore, in actual applications, the output current may fluctuate slightly due to changes in the external environment and circuit components. In order to maintain a constant current output, the microcontroller unit U1 will continuously monitor the output current and adjust it as needed. For example, if the output current deviates slightly from the preset 10mA for some reason, the microcontroller unit U1 will immediately detect this change. It will adjust the voltage on the resistor R8 according to the feedback signal so that the output current quickly returns to the preset value. In this way, the constant current source can always maintain a stable current output to ensure the accuracy of the test results.

[0093] Among them, IOUT=0.617'REXT+15uA×0.617 / 27R+150A=22.867mA.

[0094] The constant current source provides a stable and reliable current source for the high-precision test system of medical endoscope cables, ensuring the accuracy and repeatability of the test.

[0095] In one implementation, the system further includes: an indicator light electrically connected to both the second test point and the operational amplifier subtractor circuit;

[0096] The indicator light is used to indicate whether the coaxial line to be detected is open circuit.

[0097] In the disclosed embodiment, a 12V boost circuit can be used to power a constant current source, which outputs a 20mA cross current through the wire to be tested and then connected to an LED indicator light. At the same time, the voltage at both ends of the wire to be tested is collected and connected to an op amp-subtractor circuit to output the voltage difference at both ends of the wire to be tested.

[0098] In one implementation, the display terminal includes a single-chip microcomputer and a PC terminal, and the single-chip microcomputer is connected to the operational amplifier subtractor circuit;

[0099] The single chip microcomputer is used to determine the diameter of the coaxial line of the coaxial line to be detected according to the resistance resolution and length of the coaxial line to be detected and the target voltage difference;

[0100] The PC terminal is used to visually display the coaxial line diameter.

[0101] The microcontroller uploads the data to the PC through the USB interface to bind the test results to the MES system.

[0102] In the embodiment of the present disclosure, the voltage difference output by the op amp-subtractor circuit is connected to a 16-bit high-precision ADC. The ADC adopts a 3.3V, 16-bit design with a resolution of 3.3V / 2^16≈0.05mV. The voltage difference data is then transmitted to the microcontroller through the I2C interface of the ADC. The microcontroller calculates the DC resistance of the wire by the following formula: (ΔU / I constant = R line), for example, the resistance resolution is 0.05mΩ. After testing, the embodiment of the present disclosure is 2000 times more accurate than the conventional multimeter with an accuracy of 0.1Ω / 100mΩ.

[0103] In one implementation, see Figure 6 As shown, the system includes a plurality of constant current sources, each of which is electrically connected to one of the first test points and one of the operational amplifier subtractor circuits, and the plurality of operational amplifier subtractor circuits are connected to the display terminal.

[0104] The technical solution of the disclosed embodiment is to connect a constant current source to the coaxial line, and add a subtractor at both ends of the wire to collect the voltage difference at both ends of the wire. Then it is converted into a precise digital voltage through a high-precision ADC to calculate the DC resistance of the coaxial line. An LED is connected to the end of the coaxial line to visually confirm whether the wire is open. A single-chip microcomputer is used to measure the voltage drop at both ends of the wire to the ground to confirm whether the wire is short-circuited. The data is imported into the single-chip microcomputer, saved to the PC through the USB interface, and bound to the number of a single wire to realize cloud storage of data.

[0105] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the present disclosure. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0106] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A high-precision testing system for medical endoscope wires, characterized in that: The system comprises: A boost circuit, a constant current source electrically connected to the boost circuit, a first test point electrically connected to the constant current source, an operational amplifier subtractor circuit electrically connected to the constant current source, a second test point electrically connected to the operational amplifier subtractor circuit, and a display terminal connected to the operational amplifier subtractor circuit; Wherein, the first test point is used to be electrically connected to the first end of the coaxial line to be detected, and the second test point is used to be electrically connected to the second end of the coaxial line to be detected; The boost circuit is used to provide target power of a voltage magnitude corresponding to the wire diameter to the constant current source according to the wire diameter of the coaxial line to be detected; The constant current source is used to output a target current of a constant magnitude to the coaxial line to be detected based on the target power; The operational amplifier subtractor circuit is used to determine a target voltage difference between the first test point and the second test point based on a first voltage at the first test point and a second voltage at the second test point; The display end is used to determine the diameter of the coaxial line to be detected and to visually display the diameter of the coaxial line according to the resistance resolution and length of the coaxial line to be detected and the target voltage difference.

2. The system according to claim 1, characterized in that The operational amplifier subtractor circuit comprises: a voltage difference calculation subcircuit, an analog-to-digital converter connected to an output end of the voltage difference calculation subcircuit, an I2C interface of the analog-to-digital converter connected to the display end, and an input end of the voltage difference calculation subcircuit electrically connected to the first test point and the second test point respectively; The voltage difference calculation subcircuit is used to calculate the voltage difference between the first test point and the second test point; The analog-to-digital converter is used to perform analog-to-digital conversion on the voltage difference to obtain the target voltage difference of digital type.

3. The system according to claim 2, characterized in that The voltage difference calculation subcircuit includes: an amplifier, resistors R1 and R2 whose first ends are both electrically connected to the non-inverting input terminal of the amplifier, a resistor R3 whose first end is electrically connected to the inverting input terminal of the amplifier, and a resistor R4 whose first end is electrically connected to the inverting input terminal of the amplifier; The second end of the resistor R1 is electrically connected to the first test point, the second end of the resistor R2 is grounded, the second end of the resistor R3 is electrically connected to the second test point, the second end of the resistor R4 is electrically connected to the output end of the amplifier, and the output end of the amplifier is electrically connected to the input end of the analog-to-digital converter; The voltage difference output by the amplifier is the product of the voltage difference between the first test point and the second test point and the ratio between the resistor R4 and the resistor R3.

4. The system according to claim 1, characterized in that The boost circuit comprises: A microcontroller unit U2, an inductor L1 having a first end connected to a VDD input terminal of the microcontroller unit U2, a capacitor C1 having a first end connected to a first connection point, a diode D1 having an anode connected to a second end of the inductor L1, a resistor R5 having first ends connected to a cathode of the diode D1, capacitors C2 and C3, and a resistor R6 having a first end connected to a second connection point; The first connection point is a connection point between the VDD input terminal of the micro control unit U2 and the first end of the inductor L1, the CE input terminal of the micro control unit U2 is connected to the first connection point, the second end of the capacitor C1 is grounded, and the first connection point is connected to the first end of the capacitor C1 to be constructed as a voltage input terminal of the boost circuit; The first connection point is a connection point between the second end of the resistor R5 and the FB input end of the micro control unit U2, and the second ends of the capacitor C2, the capacitor C3 and the resistor R6 are all grounded; The cathode of the diode D1 is connected to the first end of the capacitor C3 to form a voltage output end of the boost circuit.

5. The system according to claim 1, characterized in that The constant current source includes: a resistor R7, a micro control unit U1 whose REXT input end is connected to a first end of the resistor R7, a resistor R8 and a capacitor C4 whose first ends are both connected to an output end of the micro control unit U1; Wherein, the micro control unit U1 is connected to the second end of the resistor R7 to be configured as a voltage input end of the constant current source, and the second end of the resistor R8 is configured as a voltage output end of the constant current source; The second terminal of the capacitor C4 is grounded.

6. The system according to any one of claims 1 to 5, characterized in that: The system further includes: an indicator light electrically connected to both the second test point and the operational amplifier subtractor circuit; The indicator light is used to indicate whether the coaxial line to be detected is open circuit.

7. The system according to any one of claims 1 to 5, characterized in that: The display end includes a single-chip microcomputer and a PC end, and the single-chip microcomputer is connected to the operational amplifier subtractor circuit; The single chip microcomputer is used to determine the diameter of the coaxial line of the coaxial line to be detected according to the resistance resolution and length of the coaxial line to be detected and the target voltage difference; The PC terminal is used to visually display the coaxial line diameter.

8. The system according to any one of claims 1 to 5, characterized in that: The system includes a plurality of constant current sources, each of which is electrically connected to one of the first test points and one of the operational amplifier subtractor circuits, and the plurality of operational amplifier subtractor circuits are connected to the display terminal.

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